Drill-jar.



E. L. CLEVELAND.

DRILL JAR.

APPLICATION HLED MAR. 15. 1915.

Patented Feb. 22, 1916.

fraszus Z. 5Z6 z/ezazza IN VEN TOR A TTOR/VEKC ERASTUS L. CLEVELAND, OF ELYRIA, OHIO.

DRILL-JAR.

Specification of Letters Patent.

Patented Feb. 22, 1916.

Application filed March 15, 1915. Serial No. 14,385.

To all whom 2'25 may concern:

Be it known that I, ERASTUS L. CLEVE- LAN 1), a citizen of the United States, residing at Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Drill-Jars, of which the following is a specification.

This invention relates to devices for connecting a well-drilling tool to the drill-rope in such a manner that the tool is jarred during the drilling operation.

The invention has for its object to provide a novel and improved drill jar and rope socket combined, which is strong and durable, highly eflicient in operation, and sim ple in construction, this object being attained by means of a combination and arrangement of parts to be hereinafter described and claimed.

In order that the invention may be better understood, reference is had to the accompanying drawing in which Figure 1 is an elevation of the device, and Fig. 2 is a central vertical section thereof.

Referring specifically to the drawing, the device comprises slidably connected upper and lower members 5 and 6, respectively, each composed of a single piece of thick solid metal. The lower member has a threaded bottom socket 7 for attachment of the drill or other tool, and the upper member has a longitudinal passage 8 for connection of the drill-rope 9, said passage having a laterally extending portion 10 at its lower end opening through the side of the member, in which the rope is made fast in the ordinary manner. Intermediate its ends, the bottom member has an externally squared portion 11 to facilitate the application of a wrench.

In the lower end of the upper member 5 is a longitudinal cavity 12 having a reduced portion 13 opening through the bottom of said member. The upper end of the lower member 6 has an integral stem 14: which extends into the cavity 12 through the reduced portion 13 thereof. On the upper end of the stem 14 is secured a head 15, the same being a hard steel collar which is held on the stem between a shoulder 16 thereon and an upset 17 at the upper end of the stem. In the bottom of the cavity 12- seats a hard steel ring 18 against which the head 15 is adapted to 'ar. tha t the head 15 is free to slide up and down therein, and hence, when the drill-rope 9 is The length of the cavity 12 is such operated, the bottom of the head and the opposite rmg below the same strike and then separate, whereby the drill or other tool carried by the member 6 is jarred, the length of the cavity being such as to give the parts sufficient travel to produce an effective jar. The member 5, at the striking surface, is of suificient thickness to withstand the blows.

Toassemble the members 5 and 6, the bottom portion of the cavity 12 is expanded while the metal is hot, and the stem 1-1 with the head 15 is inserted cold, after which the bottom portion of the member 5 is forged back into proper shape. That portion of the upper member 5 containing the cavity 12 has side apertures 19 opening into the latter for the purpose of permitting the escape of water which may accumulate in the cavity, and also to leave the parts cool while in operation. The lower member 6 has a central longitudinal passage 20 continuing through the stem 1 1, to reduce the weight of these parts without reducing the strength thereof, and also to allow a mandrel or other tool to be driven in at the top to form the upset or spread 17 which secures the head 15.

By the structure hereinbefore described, a jarring action and rope socket is obtained, the head 15 providing a swiveling connection between the parts 5 and 6.

I claim:

1. A drill-jar comprising upper and lower relatively slidable members, the lower member having means for supporting a tool, and the upper member having a longitudinal cavity reduced at its lower end and opening through the bottom of said member, a ring seating in the bottom of the cavity, a stem extending from the lower member and passing into the cavity of the upper member through the reduced lower end thereof and the ring, the upper end of the stem having spaced shoulders, a head mounted on the stem between said shoulders, said head being loose in the cavity to provide a sliding and swiveling connection between'the members, and a drill-rope directly connected to the upper member.

2. A drill-jar comprising upper and lower relatively slidable members, the lower member having means for supporting a tool, and provided with a longitudinal opening, and the upper member having a longitudinal cavity reduced at its lower end and opening through the bottom of said member, a ring seating in the bottom of the cavity, a stem extending from the lower member and passand a drill-rope directly connected to the ing into the cavity of the upper member upper member. 10 through the reduced lower end thereof and In testimony whereof I affix my signature the ring, the upper end of the stem having in presence of two witnesses.

-. spaced shoulders. a head mounted on the ERASTUS L. CLEVELAND.

stem between said shoulders, said head being Witnesses: loose in the cavity to provide a sliding and S. J. LEHRER, swiveling connection between the members H. G. BATCHELOR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

